Hi Sagar - Welcome to the Atlassian Community!
Is it just one Dashboard that is not loading? Are other things in Jira (including other Dashboards) loading?
Over all, Jira Cycle create, clone also not working. Previously created cycle also not loading
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Which add-on app are you using?
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How are you creating these test cycles then? It appears you are using Zephyr Scale plugin. You should contact the vendor directly.
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